1 Answer
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Your new partition (/dev/sda4) is just after /dev/sda3, which should make things straightforward.

Booting from a gparted live-CD (which, from your /dev/sr0, seems that you already have) and then resizing /dev/sda3 should work, but back up your /home first (you might have hard drive corruption if you lose power, your virtual machine or host OS freezes/crashes, etc...).